Effect of prior corrosion state on the fatigue small cracking behaviour of 6151-T6 aluminum alloy

Li, Xudong; Wang, Xi-Shu; Ren, Huaihui; Chen, Yinglong; Mu, Zhitao

doi:10.1016/j.corsci.2011.09.025

Cited by 66 publications

(44 citation statements)

References 26 publications

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“…The environmental effect on the fatigue fracture of 25CrMo axle steel not only depends on the formation of corrosive pits and solution exposure time but also depends on the local deformation of the metal (stress level). The former involves the transformation of corrosion pits to stress corrosion cracks and the latter involves a electrochemical process (anodic dissolution) and hydrogen embrittlement due to the cyclic deformation on the surface [26,[31][32][33]. In addition, there is some scatter in the corrosive fatigue data, including the fatigue data for the samples tested in air, as shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

“…This is because the fatigue fracture life depends primarily on the inside crack propagation length (a) in the environmental fatigue condition. A greater inside crack propagation length indicates a stronger stress-corrosion coupling effect [26,[31][32][33]35]. Therefore, the probability of the corrosion solution acting on the surface crack at the multi-crack initiation sites is lower than it acting on the single crack initiation sites.…”

Section: Fractography Analysismentioning

confidence: 99%

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High-Cycle Microscopic Severe Corrosion Fatigue Behavior and Life Prediction of 25CrMo Steel Used in Railway Axles

Wang

et al. 2017

Metals

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Abstract:The effects of environmental media on the corrosion fatigue fracture behavior of 25CrMo steel were investigated. The media include air, and 3.5 wt % and 5.0 wt % NaCl solutions. Experimental results indicate that the media induces the initiation of corrosion fatigue cracks at multiple sites. The multi-cracking sites cause changes in the crack growth directions, the crack growth rate during the coupling action of the media, and the stress amplitude. The coupling effects are important for engineering applications and research. The probability and predictions of the corrosion fatigue characteristic life can be estimated using the three-parameter Weibull distribution function.

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Section: Resultsmentioning

confidence: 99%

Section: Fractography Analysismentioning

confidence: 99%

High-Cycle Microscopic Severe Corrosion Fatigue Behavior and Life Prediction of 25CrMo Steel Used in Railway Axles

Wang

et al. 2017

Metals

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“…However, it is widely accepted that corrosion fatigue crack initiation points are due to surface defects (such as corrosion pits and voids) of aluminium alloys caused by NaCl aqueous solutions by previous literature. 10,[13][14][15]27,28 In addition, effects of second cracks of high-strength aluminium alloy, 7475-T7351 and 7075-T651, as shown in Fig. 2a and b, and voids of high-ductility aluminium alloys, LY12-CZ and 2024-T4, as shown in Fig.…”

Section: R E S U L T S a N D Discussion Smentioning

confidence: 99%

Synergistic effect of environmental media and stress on the fatigue fracture behaviour of aluminium alloys

Yang

Wang

et al. 2016

Fatigue Fract Eng Mat Struct

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A B S T R A C T The present study aims at explaining the synergistic effect of environmental media and stress/strain on fatigue lives of aluminium alloys. Rotating bending fatigue tests were carried out using four different aluminium alloys LY12-CZ, 2024-T4, 7475-T7351 and 7075-T651, at air state, 3.5% and 5.0% NaCl aqueous solutions. These results indicated that synergistic actions of the environmental media and cyclic loading accelerated the fatigue crack propagation of aluminium alloys. Furthermore, various influence factors (such as solution concentration, cyclic numbers, high (low) strength aluminium alloys etc.) of the fatigue life at synergistic actions of the environmental media and stress were quantificationally discussed in this paper.Keywords aluminium alloy; corrosion environment; fatigue life; fracture behaviour; synergistic effect. N O M E N C L A T U R Eα = the stress concentration factor (1.08) B, C = the distance between adjacent striations, respectively d, L = the geometry size, respectively g = the acceleration of gravity (9.8 m/s 2 ) N f = number of cycles to failure σ = stress amplitude (MPa) R = stress ratio I N T R O D U C T I O NThere have been growing interests in light metals, such as aluminium, magnesium and titanium-aluminium alloys, which have been widely applied to aeronautic and automotive industries because of their high strength-toweight ratios, 1-3 but improvements are needed in their fatigue properties, 4-8 very high-cycle fatigue behaviour of aluminium alloys 9-11 and some factors of high humidity on fatigue properties of aluminium alloys. 12As one of the important materials in aeronautic and automotive structures, the aluminium alloy is usually directly exposed to the corrosive environment with stress/strain, 13 in which the corrosive fatigue cracking mechanism is rather a complex process and needs to be deeply understood. More data, especially fatigue properties in such an environment, are crucial for safety. In recent years, many studies have focused on the fatigue behaviour of Al alloys in the corrosive environment.14 Li et al. 15estimated the effect of pre-corrosion states on the fatigue microcrack initiation and early stage propagation behaviour of 6151-T6 aluminium alloy based on scanning electron microscopy (SEM) in situ observation. Hui et al. 16 and Qian et al.14 conducted fatigue life tests in the laboratory air and salt water environment by using several pre-corrosion 7XXX aluminium alloys and a structural steel 40Cr and reported that the salt water environment significantly reduced the fatigue performance, especially under low stress amplitude and the fatigue life is about 2.2% of that at air state. These results indicated that the effect of different pre-corrosion states on the fatigue damage of aluminium alloys is mainly producing more stress concentration sites (or pits) and inducing more fatigue cracks. Zhang et al. 17proposed a novel model to predict the residual fatigue life of 2A12 aluminium alloy subjected to alternating corrosion and fatigue based on the ...

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“…All fatigue data for the different environmental media are plotted in Figure 3 involves the transformation of corrosion pits to stress corrosion cracks and the latter involves a electrochemical process (anodic dissolution) and hydrogen embrittlement due to the cyclic deformation on the surface [23,[27][28][29]. In addition, there is some scatter in the corrosive fatigue data, including the fatigue data for the samples tested in air, as shown in Figure 3.…”

Section: Resultsmentioning

confidence: 99%

Section: Fractography Analysismentioning

confidence: 99%

High-Cycle Microscopic Corrosion Fatigue Behavior and Life Prediction of 25CrMo Steel Used in Railway Axle

Wang¹,

Wang²,

Wu³

et al. 2017

Preprint

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Abstract:The effects of environmental media on the corrosion fatigue fracture behavior of 25CrMo steel were investigated. The media include air, and a 3.5 wt.% and a 5.0 wt.% NaCl solutions.Experimental results indicate that the media induces the initiation of corrosion fatigue cracks at multiple sites. The multi-cracking sites cause the changes in the crack growth directions, the crack growth rate during the coupling action of the media and the stress amplitude. The coupling effects are important for engineering applications and research. The probability and predictions of the corrosion fatigue characteristic life can be estimated using the 3-parameter Weibull distribution function.

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Effect of prior corrosion state on the fatigue small cracking behaviour of 6151-T6 aluminum alloy

Cited by 66 publications

References 26 publications

High-Cycle Microscopic Severe Corrosion Fatigue Behavior and Life Prediction of 25CrMo Steel Used in Railway Axles

High-Cycle Microscopic Severe Corrosion Fatigue Behavior and Life Prediction of 25CrMo Steel Used in Railway Axles

Synergistic effect of environmental media and stress on the fatigue fracture behaviour of aluminium alloys

High-Cycle Microscopic Corrosion Fatigue Behavior and Life Prediction of 25CrMo Steel Used in Railway Axle

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